Multi-channel multi-target satellite-borne AIS (Automatic Identification System) reconnaissance signal simulation system

Abstract

The invention relates to a multi-channel multi-target satellite-borne AIS (Automatic Identification System) reconnaissance signal simulation system, and is a system for simulating a multi-target aliasing dynamic AIS signal received when a satellite-borne AIS multi-channel reconnaissance system carries out in-orbit operation. All filtering and frequency conversion of four channels of AIS signals and two paths of signals generated by the system can be subjected to all-digital calculation, interchannel consistency is good, signal straying is small, and a harmonic component is good; a clock sampling rate is high, the time resolution of the generated AIS signal is high, and the control accuracy of time delay can achieve about a 8us order of magnitude; a quantity of AIS targets which can be generated is large, continuous simulation time is long (which is longer than five minutes), and any scene of 0-10000 ships in the same field of view can be simulated. By use of the system, a purpose that the dynamic-change multi-target aliasing AIS radio frequency signal which receives Doppler frequency shift, amplitude fluctuation and the like caused by relative movement during satellite-borne reconnaissance can be vividly generated is realized.

Description

technical field [0001] The invention belongs to the technical field of signal simulation and simulation, and relates to a signal simulation system, in particular to a multi-channel and multi-target analog transposition of automatic ship identification system (AIS) signals emitted by various ships on the sea surface by satellite reconnaissance. Background technique [0002] The Automatic Identification System (AIS) is a system that automatically broadcasts and receives ship dynamic and static information in the VHF maritime mobile frequency band using self-organizing time-division multiple access to realize identification, monitoring and communication. At present, it has been widely installed on various large, medium and small ships to realize the functions of sending and receiving short messages between ships and shores, interactive messages, navigation and collision avoidance. In order to realize the effective monitoring and management of ships, the satellite-borne ship aut...

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Problems solved by technology

Since the satellite is launched into the sky and in orbit, it is impossible to find some standard scenarios to verify and calibrate various technical indicators of the spaceborne AIS system. In order to accurately and quantitatively evaluate the performance of the spaceborne AIS system, it is necessary to develop a special Multi-channel multi-target spaceborne AIS reconnaissance signal simulator

[0004] Chinese patent application 201610786782.5 proposes an AIS data simulation method in a marine electronic application system, but this method is mainly used to simulate the data of a single AIS target, and cannot generate Doppler frequency shift caused by relative motion during spaceborne reconnaissance. Dynamically changing AIS radio frequency signals such as amplitude fluctuations cannot simulate and generate multi-target spaceborne AIS reconnaissance multi-channel receiver coherent aliasing signals, and these are precisely the most critical factors affecting the performance of spaceborne AIS reconnaissance systems

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